Which waterway, Chain of Rocks Lock or Dismal Swamp Canal, is the oldest continually operating man-made canal in the United States?
Dismal Swamp Canal
-1
Section::::Abstract.
Chain of Rocks Lock
7444928
-1
Section::::Abstract.
Dismal Swamp Canal
1718875
-1
Section::::Abstract.
Dismal Swamp Canal
1718875